Abstract
Monodisperse magnetic hydroxyapatite (HAp)/Fe3O4 microspheres were successfully synthesized and explored for the removal of lead(II) from aqueous solution. The mechanism of Pb2+ uptake was characterized using X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis. The sorption capacity toward Pb2+ reached 440mg/g at pH 3.0 and equilibrium was achieved within 1h. The experimental data followed the Langmuir isotherm model (R2=0.9969) and the kinetic results accorded with the pseudo-second-order model (R2=0.9970). The sorption of Pb2+ on the surfaces of HAp/Fe3O4 and the following ion exchange are the primary mechanism at pH 3.0–6.0. The dissolution–precipitation mechanism response to the removal of Pb2+ when pH varied from 3.0 to 2.0. The Pb2+-loaded magnetic HAp/Fe3O4 could be separated conveniently.
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